You seem to be confused between X11 as a protocol (and, used loosely, its many implementations) and a specific X11 server.

Within the Linux community, the primary X11 implementation has been the XFree86 server, which forked into XOrg over licensing disputes, which forked into XLibre over the development roadmap.

Other implementations include XQuartz (also based on XOrg) and Xlibe (not a traditional server but implements X11 by translating into native Haiku graphics API calls). There's also Xming and android-xserver (written in Java!), among many others.

XOrg may be abandoned. That doesn't mean the entire ecosystem is.